I've used WoL a few times before, and played against a few too. It's definitely not common.
Sunbreakers do have fusion grenades that heal them, and their melee override is very good. I think the subclass outside of the super is decent.
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The health regen on solar ability kill is a perk and to kill with a fusion you need to get fairly close. Also you cant really go in and punch oryx with melting point.
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What? Fusion grenades are 1 hit kills in crucible, and on many enemies in pve. Have to get close? You mean you have to stick someone? Well duh! You're right you won't be meleeing Oryx, but then again, what class uses abilities on Oryx?
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Cauterize is a perk which means you sacrifice something else for it.
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Every ability is a perk meaning you sacrifice something else. It is unclear what your argument is.